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Finding the Fourth Proportional to 1,159.69, 1,739.46 and 429.21

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Solution

The fourth proportional to 1,159.69, 1,739.46 and 429.21 is: 643.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.69 : 1,739.46 = 429.21 : x
  2. Step 2: Convert to fraction form
    1,159.69/1,739.46 = 429.21/x
  3. Step 3: Cross multiply
    1,159.69x = 1,739.46 × 429.21
  4. Step 4: Simplify right side
    1,159.69x = 746,593.63
  5. Step 5: Solve for x
    x = 746,593.63/1,159.69
  6. Step 6: Final answer
    x = 643.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.